So I made a set of grass autotiles for a game I'm working on. They seem to be working properly, except when I put them in the editor, the top-right and top-left inner corners show up like this: And here's the tileset. (Most of the tiles in here are dummies, as I'm far from finished making this tileset. My grass tiles can be seen toward the lower left.) Does anyone know what to do about this problem? Is it a glitch in the editor, or is there something wrong with my tileset?